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Breeding Of Plants And Reproduction By Means Of Culturing
(AREA)
Abstract
A circular rule of calculation, composed of two disks of different diameter coupled by their center in the form of that they can rotate freely, characterized by presenting their two major graduated scales of the two discs indicated, divided into three different colors that value these graduations at the reading effects of the results that are carried out with those scales, and by being provided with a cursor that has engraved an angle of a value to find in a simple reading the area of a circular surface, known diameter. (Machine-translation by Google Translate, not legally binding)
Calculation device to determine the agenesis and conceptional periods in the menstrual cycle of women (Machine-translation by Google Translate, not legally binding)